<div class="problemindexholder" problemindex="B">
 <div class="ttypography">
  <div class="problem-statement">
   <div class="header">
    <div class="title">
     B. Crossword solving
    </div>
    <div class="time-limit">
     <div class="property-title">
      time limit per test
     </div>
     1 second
    </div>
    <div class="memory-limit">
     <div class="property-title">
      memory limit per test
     </div>
     256 megabytes
    </div>
    <div class="input-file">
     <div class="property-title">
      input
     </div>
     standard input
    </div>
    <div class="output-file">
     <div class="property-title">
      output
     </div>
     standard output
    </div>
   </div>
   <div>
    <p>
     Erelong Leha was bored by calculating of the greatest common divisor of two factorials. Therefore he decided to solve some crosswords. It's well known that it is a very interesting occupation though it can be very difficult from time to time. In the course of solving one of the crosswords, Leha had to solve a simple task. You are able to do it too, aren't you?
    </p>
    <p>
     Leha has two strings
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     and
     <span class="tex-span">
      <i>
       t
      </i>
     </span>
     . The hacker wants to change the string
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     at such way, that it can be found in
     <span class="tex-span">
      <i>
       t
      </i>
     </span>
     as a substring. All the changes should be the following: Leha chooses one position in the string
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     and replaces the symbol in this position with the question mark "
     <span class="tex-font-style-tt">
      ?
     </span>
     ". The hacker is sure that the question mark in comparison can play the role of an arbitrary symbol. For example, if he gets string
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     ="
     <span class="tex-font-style-tt">
      ab?b
     </span>
     " as a result, it will appear in
     <span class="tex-span">
      <i>
       t
      </i>
     </span>
     ="
     <span class="tex-font-style-tt">
      aabrbb
     </span>
     " as a substring.
    </p>
    <p>
     Guaranteed that the length of the string
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     doesn't exceed the length of the string
     <span class="tex-span">
      <i>
       t
      </i>
     </span>
     . Help the hacker to replace in
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     as few symbols as possible so that the result of the replacements can be found in
     <span class="tex-span">
      <i>
       t
      </i>
     </span>
     as a substring. The symbol "
     <span class="tex-font-style-tt">
      ?
     </span>
     " should be considered equal to any other symbol.
    </p>
   </div>
   <div class="input-specification">
    <div class="section-title">
     Input
    </div>
    <p>
     The first line contains two integers
     <span class="tex-span">
      <i>
       n
      </i>
     </span>
     and
     <span class="tex-span">
      <i>
       m
      </i>
     </span>
     (
     <span class="tex-span">
      1 ≤
      <i>
       n
      </i>
      ≤
      <i>
       m
      </i>
      ≤ 1000
     </span>
     ) — the length of the string
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     and the length of the string
     <span class="tex-span">
      <i>
       t
      </i>
     </span>
     correspondingly.
    </p>
    <p>
     The second line contains
     <span class="tex-span">
      <i>
       n
      </i>
     </span>
     lowercase English letters — string
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     .
    </p>
    <p>
     The third line contains
     <span class="tex-span">
      <i>
       m
      </i>
     </span>
     lowercase English letters — string
     <span class="tex-span">
      <i>
       t
      </i>
     </span>
     .
    </p>
   </div>
   <div class="output-specification">
    <div class="section-title">
     Output
    </div>
    <p>
     In the first line print single integer
     <span class="tex-span">
      <i>
       k
      </i>
     </span>
     — the minimal number of symbols that need to be replaced.
    </p>
    <p>
     In the second line print
     <span class="tex-span">
      <i>
       k
      </i>
     </span>
     <span class="tex-font-style-bf">
      distinct
     </span>
     integers denoting the positions of symbols in the string
     <span class="tex-span">
      <i>
       s
      </i>
     </span>
     which need to be replaced. Print the positions in any order. If there are several solutions print any of them. The numbering of the positions begins from one.
    </p>
   </div>
   <div class="sample-tests">
    <div class="section-title">
     Examples
    </div>
    <div class="sample-test">
     <div class="input">
      <div class="title">
       Input
      </div>
      <pre>3 5<br/>abc<br/>xaybz<br/></pre>
     </div>
     <div class="output">
      <div class="title">
       Output
      </div>
      <pre>2<br/>2 3 <br/></pre>
     </div>
     <div class="input">
      <div class="title">
       Input
      </div>
      <pre>4 10<br/>abcd<br/>ebceabazcd<br/></pre>
     </div>
     <div class="output">
      <div class="title">
       Output
      </div>
      <pre>1<br/>2 <br/></pre>
     </div>
    </div>
   </div>
  </div>
  <p>
  </p>
 </div>
</div>
